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The speed/load characteristics of a universal motor is same as that of?
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asked
Mar 20, 2018
by
anonymous
speed
load
characteristics
universal
motor
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1
Answer
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answered
Mar 20, 2018
by
anonymous
The speed/load characteristics of a universal motor is same as that of
D.C. series motor.
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Related questions
asked
Mar 20, 2018
by
anonymous
The speed of a universal motor is usually reduced by using?
Last answer:
The speed of a universal motor is usually reduced by using gearing.
speed
universal
motor
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78
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1
answer
asked
Mar 20, 2018
by
anonymous
Speed control of a universal motor is achieved by?
Last answer:
Speed control of a universal motor is achieved by varying field flux with tapped field windings, connecting rheostat in series, applying variable voltage by means of silicon controlled rectifier, applying variable voltage by means of variable auto-transformer.
speed
control
universal
motor
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77
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1
answer
asked
Mar 20, 2018
by
anonymous
The speed control of universal motor used for sewing machines is by?
Last answer:
The speed control of universal motor used for sewing machines is by varying the resistance.
speed
control
universal
motor
used
sewing
machines
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70
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1
answer
asked
Mar 20, 2018
by
anonymous
The speed of a universal motor is generally reduced by using?
Last answer:
The speed of a universal motor is generally reduced by using gear trains.
speed
universal
motor
reduced
using
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69
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1
answer
asked
Mar 20, 2018
by
anonymous
For the same H.P. rating and full load speed, following motor has poor starting torque?
Last answer:
For the same H.P. rating and full load speed, following motor has poor starting torque differentially compounded.
hp
rating
full
load
speed
motor
poor
starting
torque
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115
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1
answer
asked
Mar 20, 2018
by
anonymous
As the load is increased the speed of D.C. shunt motor will?
Last answer:
As the load is increased the speed of D.C. shunt motor will reduce slightly.
load
increased
speed
dc
shunt
motor
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106
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1
answer
asked
May 8, 2018
by
anonymous
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s.
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net Voltage across armature resistance at the time of plugging will be
Last answer:
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net Voltage across armature resistance at the time of plugging will be 474 V
dc
shunt
motor
rated
load
speed
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225
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1
answer
asked
Jul 5, 2019
by
anonymous
Why does the speed of a DC shunt motor decrease as the load increases?
Why does the speed of a DC shunt motor decrease as the load increases?
Last answer:
Because if the load is increasing then the torque must also be increase. If not then the speed of motor will decrease.
why
does
the
speed
of
a
dc
shunt
motor
decrease
as
load
increases
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1
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asked
Mar 20, 2018
by
anonymous
In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will?
Last answer:
In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will run as induction motor.
reluctance
motor
synchronous
speed
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87
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1
answer
asked
Mar 20, 2018
by
anonymous
In a universal motor, the most common cause of brush sparking is?
Last answer:
In a universal motor, the most common cause of brush sparking is open armature winding, shorted armature winding, shorted field winding, high commutator mica.
universal
motor
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100
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1
answer
asked
Mar 20, 2018
by
anonymous
A universal motor is one which?
Last answer:
A universal motor is one which can be operated either on D.C. or A.C. supply at approximately the same speed and output.
universal
motor
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46
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1
answer
asked
Mar 20, 2018
by
anonymous
The direction of rotation of universal motor can be reversed the by reversing the flow of current through?
Last answer:
The direction of rotation of universal motor can be reversed the by reversing the flow of current through either armature winding or field winding.
direction
rotation
universal
motor
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104
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1
answer
asked
Mar 20, 2018
by
anonymous
Speed torque characteristic of a repulsion induction motor is similar to that of a D.C.?
Last answer:
Speed torque characteristic of a repulsion induction motor is similar to that of a D.C. compound motor.
speed
torque
characteristic
repulsion
induction
motor
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69
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1
answer
asked
Mar 19, 2020
by
anonymous
KVL solved problem non linear load VI characteristics equation
Last answer:
https://youtu.be/fgQTs-1hq7Q
kvl
solved
problem
non
linear
load
vi
characteristics
equation
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42
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1
answer
asked
Mar 20, 2018
by
anonymous
A universal motor can run on?
Last answer:
A universal motor can run on either A.C. or D.C.
universal
motor
run
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49
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1
answer
asked
Aug 17, 2019
by
anonymous
State working principle of universal motor with the help of diagram.
State working principle of universal motor with the help of diagram.
Last answer:
Working Principle of Universal motor : It is modified DC series motor which can work on AC as well as DC supply. According to basic motor principle, whenever a current carrying conductor is placed in magnetic ... They have nearly same operating characteristic for both AC and DC supply.
universal
motor
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56
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1
answer
asked
Aug 17, 2019
by
anonymous
applications of each: i) Universal motor ii) Stepper motor.
applications of each: i) Universal motor ii) Stepper motor.
Last answer:
i) Applications of Universal motor: 1) portable drills 2) hair dryers 3) grinders 4) mixers 5) table-fans 6) blowers 7) polishers 8) Kitchen appliances ii) Applications of Stepper motor ... 7) robotics 8) CNC machine 9) Control systems 10) Biomedical applications 10) XY recorder 11) plotters
universal
motor
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1
answer
asked
Jul 26, 2019
by
anonymous
State two applications of 1) Shaded pole motor 2) Universal motor
State two applications of 1) Shaded pole motor 2) Universal motor
Last answer:
(i)Applications of Shaded pole motor: 1. Small fans 2. Toy motors 3. Hair dryers 4. Ventilators 5. Electric clocks 6. Record players 7. Motorized valves 8. Gramophones 9. Photocopying ... 5. Portable Drilling Machines 6. Electric Shavers 7. Mechanical computing Machines 8. Machine Tools etc.
applications
shaded
pole
motor
universal
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97
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1
answer
asked
Jul 20, 2019
by
anonymous
Draw and explain working of universal motor. Give two applications of universal motor.
Draw and explain working of universal motor. Give two applications of universal motor.
Last answer:
Figure of Universal motor: Operation of universal motor on A.C. and D.C. supply: *A universal motor works on either DC or single phase AC supply. When the universal motor is ... , regardless of AC or DC supply, universal motor works on the same principle that DC series motor works.
universal
motor
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254
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4
answers
asked
May 1, 2018
by
anonymous
The speed of a three-phase induction motor is controlled by variable voltage variable frequency control
The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque (1) Decreases (2) Increases (3) Remains constant (4) None of the above
Last answer:
The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque Increases
speed
three-phase
induction
motor
controlled
variable
voltage
frequency
control
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118
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1
answer
asked
Mar 20, 2018
by
anonymous
The speed of a D.C. series motor is?
Last answer:
The speed of a D.C. series motor is inversely proportional to the armature current.
speed
series
motor
dc
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71
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1
answer
asked
Mar 20, 2018
by
anonymous
In a D.C. shunt motor, speed is?
Last answer:
In a D.C. shunt motor, speed is independent of armature current.
dc
shunt
motor
speed
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1
answer
asked
Apr 28, 2018
by
anonymous
The speed of a 2-pole, 3-phase stepper motor operated by 1200 pulses/min
The speed of a 2-pole, 3-phase stepper motor operated by 1200 pulses/min (A) 100 rpm (B) 200 rpm (C) 400 rpm (D) 800 rpm
Last answer:
The speed of a 2-pole, 3-phase stepper motor operated by 1200 pulses/min 200 rpm
speed
2-pole
3-phase
stepper
motor
operated
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121
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1
answer
asked
Mar 20, 2018
by
anonymous
The speed of a D.C. motor can be controlled by varying
The speed of a D.C. motor can be controlled by varying 1. Its flux per pole 2. Resistance of armature circuit 3. Applied voltage 4. All of the above
Last answer:
The speed of a D.C. motor can be controlled by varying 1. Its flux per pole 2. Resistance of armature circuit 3. Applied voltage 4. All of the above
speed
dc
motor
varying
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115
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1
answer
asked
Mar 20, 2018
by
anonymous
The speed of a D.C. shunt motor can be increased by?
Last answer:
The speed of a D.C. shunt motor can be increased by increasing the resistance in field circuit.
speed
dc
shunt
motor
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88
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1
answer
asked
Apr 28, 2018
by
anonymous
The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a
The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ (A) directly proportional to α and Φ (B) inversely proportional to α and Φ (C) directly proportional to α and inversely proportional to Φ (D) directly proportional to Φ and inversely proportional to α
Last answer:
The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ directly proportional to α and inversely proportional to Φ
no-load
speed
single-phase
scr
bridge
converter
fed
separately
excited
dc
motor
operating
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122
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1
answer
asked
Mar 15, 2018
by
anonymous
Why the speed of synchronous motor is constant?
Why the speed of synchronous motor is constant?
speed
synchronous
motor
constant
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54
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0
answers
asked
Mar 18, 2018
by
anonymous
An electric motor in which both stator field and rotor rotates with same speed is called?
An electric motor in which both stator field and rotor rotates with same speed is called?
Last answer:
An electric motor in which both stator field and rotor rotates with same speed is called synchronous motor.
electric
motor
stator
field
rotor
rotates
speed
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92
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1
answer
asked
Mar 20, 2018
by
anonymous
Centrifugal switch disconnects the auxiliary winding of the motor at about what percent of synchronous speed?
Last answer:
Centrifugal switch disconnects the auxiliary winding of the motor at about 70 to 80 percent of synchronous speed.
centrifugal
switch
disconnects
auxiliary
winding
motor
synchronous
speed
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139
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1
answer
asked
Mar 20, 2018
by
anonymous
If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in?
Last answer:
If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in damage to the starting winding.
synchronous
speed
motor
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69
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1
answer
asked
Dec 16, 2017
by
anonymous
What are the speed control methods of dc motor?
What are the speed control methods of dc motor?
Last answer:
Field control of DC motor Armature control of DC motor
speed
control
methods
dc
motor
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150
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2
answers
asked
Aug 9, 2017
by
anonymous
speed control methods of three phase induction motor?
speed control methods of three phase induction motor?
Last answer:
Speed control of three phase induction motor
speed
control
phase
induction
motor
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196
views
2
answers
asked
Mar 20, 2018
by
anonymous
Which motor has the poorest speed control?
Last answer:
Series motor has the poorest speed control.
motor
poorest
speed
control
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79
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1
answer
asked
Mar 20, 2018
by
anonymous
In variable speed motor?
Last answer:
In variable speed motor a weaker commutating field is needed at low speed than at high speed.
variable
speed
motor
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1
answer
asked
Apr 28, 2018
by
anonymous
The effect of increasing load on a synchronous motor running with normal excitation is
The effect of increasing load on a synchronous motor running with normal excitation is (A) Increase both its Ia and power factor. (B) Decrease Ia, but increase power factor. (C) Increase Ia, but decrease power factor (D) Decrease both Ia and power factor.
Last answer:
The effect of increasing load on a synchronous motor running with normal excitation is Increase Ia, but decrease power factor
effect
load
synchronous
motor
running
normal
excitation
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401
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1
answer
asked
Mar 3, 2018
by
anonymous
In synchronous motor, does the winding losses vary with load?
In synchronous motor, does the winding losses vary with load?
Last answer:
No, in the synchronous motor the winding losses do not vary with load.
synchronous
motor
winding
losses
vary
load
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492
views
1
answer
asked
Mar 20, 2018
by
anonymous
The coupling angle or load angle of synchronous motor is defined as the angle between the?
Last answer:
The coupling angle or load angle of synchronous motor is defined as the angle between the rotor and the stator poles of opposite polarity.
coupling
angle
load
synchronous
motor
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136
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1
answer
asked
Mar 20, 2018
by
anonymous
If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will?
Last answer:
If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will increase.
speed
dc
shunt
motor
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111
views
1
answer
asked
Mar 20, 2018
by
anonymous
The operating speed of a synchronous motor can be changed to new fixed value by?
Last answer:
The operating speed of a synchronous motor can be changed to new fixed value by changing frequency.
operating
speed
synchronous
motor
fixed
value
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83
views
1
answer
asked
Mar 15, 2018
by
anonymous
How do you measure the speed of a motor?
How do you measure the speed of a motor?
measure
speed
motor
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37
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0
answers
asked
Dec 31, 2017
by
anonymous
The synchronous speed of an 8 pole induction motor supplied power from a 50 Hz source will be ?
The synchronous speed of an 8 pole induction motor supplied power from a 50 Hz source will be ?
Last answer:
Ns equals f/pair pole 50/4 - 12.5
induction
motor
synchronous
speed
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119
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2
answers
asked
Oct 13, 2019
by
anonymous
Speed control of the motor using TRIAC
Speed control of the motor using TRIAC
Last answer:
Speed control of the motor using TRIAC: This basic phase triggering circuit uses the triac in series with the motor across an AC sinusoidal supply. The variable resistor, VR1 is used ... meaning that it may not trigger at the exact same point for each positive and negative half cycle.
speed
control
motor
triac
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209
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1
answer
asked
Mar 18, 2018
by
anonymous
If we change the excitation of synchronous machine will it affect on motor speed?
If we change the excitation of synchronous machine will it affect on motor speed?
Last answer:
No, If we change the excitation of synchronous machine it will not affect on motor speed.
change
excitation
synchronous
machine
affect
motor
speed
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70
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1
answer
asked
Mar 15, 2018
by
anonymous
Which motor has the best speed regulation?
Which motor has the best speed regulation?
motor
speed
regulation
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44
views
0
answers
asked
Mar 18, 2018
by
anonymous
Synchronous motor always runs at which speed?
Synchronous motor always runs at which speed?
Last answer:
Synchronous motor always runs at synchronous speed.
synchronous
motor
always
runs
speed
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59
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1
answer
asked
Mar 20, 2018
by
anonymous
If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens?
Last answer:
If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens this will make armature to take heavy current, possibly burning it.
dc
shunt
motor
working
full
load
field
circuit
suddenly
opens
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103
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1
answer
asked
Mar 20, 2018
by
anonymous
The maximum constant load torque under which a synchronous motor will pull into synchronism...
The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as?
Last answer:
The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as pull-in torque.
maximum
constant
load
torque
synchronous
motor
synchronism
rated
rotor
supply
voltage
frequency
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215
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1
answer
asked
Mar 20, 2018
by
anonymous
A synchronous motor running with normal excitation adjusts to load increases essentially by increase in?
Last answer:
A synchronous motor running with normal excitation adjusts to load increases essentially by increase in armature current.
synchronous
motor
running
normal
excitation
load
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87
views
1
answer
asked
Mar 18, 2018
by
anonymous
In a synchronous motor which losses varies with load?
In a synchronous motor which losses varies with load?
Last answer:
In a synchronous motor, copper losses varies with load.
synchronous
motor
losses
varies
load
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62
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1
answer
asked
Mar 18, 2018
by
anonymous
If the load of the normally excited synchronous motor is increased the power factor will?
If the load of the normally excited synchronous motor is increased the power factor will?
Last answer:
If the load of the normally excited synchronous motor is increased the power factor will become lagging.
load
normally
excited
synchronous
motor
increased
power
factor
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82
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1
answer
...